Toyota Corolla Instruction Manual page 235

 Raindrop sensor (vehicles with rain-sensing windshield wipers)
 The raindrop sensor judges the amount
of raindrops.
An optical sensor is adopted. It may not
operate properly when sunlight from the
rising or setting of the sun intermittently
strikes the windshield, or if bugs etc. are
present on the windshield.
 Vehicles without a smart entry & start system: If the wiper switch is turned to
the "AUTO" position while the engine switch is in the "ON" position, the
wiper will operate once to show that "AUTO" mode is activated.
Vehicles with a smart entry & start system: If the wiper switch is turned to
the "AUTO" position while the engine switch is in IGNITION ON mode, the
wiper will operate once to show that "AUTO" mode is activated.
 If the temperature of the raindrop sensor is 90C (194F) or higher, or -15C
(5F) or lower, automatic operation may not occur. In this case, operate the
wipers in any mode other than "AUTO".
 If no windshield washer fluid sprays
Check that the washer nozzles are not blocked if there is washer fluid in the
windshield washer fluid reservoir.
CAUTION
 Caution regarding the use of washer fluid
When it is cold, do not use the washer fluid until the windshield becomes
warm. The fluid may freeze on the windshield and cause low visibility. This
may lead to an accident, resulting in death or serious injury.
 Caution regarding the use of windshield wipers in "AUTO" mode (vehi-
cles with rain-sensing windshield wipers)
The windshield wipers may operate unexpectedly if the sensor is touched or
the windshield is subject to vibration in "AUTO" mode. Take care that your
fingers etc. do not become caught in the windshield wipers.
Corolla_TMMT_EE (OM12F04E)
4-3. Operating the lights and wipers
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